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When a river floods, its crest is the highest level the floodwaters reach. After the crest, the river level starts going down.

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Watson Dooley

Lvl 13
1y ago
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Wiki User

15y ago

Water flows down a river in waves, just like the waves in an ocean. If it rains a lot upstream , the water down stream does not rise at the same time. The wave of water moves down stream, the waves highest point is called the crest. When the crest moves past a location on the river,this is called cresting.

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Q: What is a river crest?
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